131444321221 has 2 divisors, whose sum is σ = 131444321222. Its totient is φ = 131444321220.

The previous prime is 131444321213. The next prime is 131444321237. The reversal of 131444321221 is 122123444131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80663952196 + 50780369025 = 284014^2 + 225345^2 .

It is a cyclic number.

It is not a de Polignac number, because 131444321221 - 2³ = 131444321213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131444321221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131444321291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65722160610 + 65722160611.

It is an arithmetic number, because the mean of its divisors is an integer number (65722160611).

Almost surely, 2^131444321221 is an apocalyptic number.

It is an amenable number.

131444321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131444321221 is an equidigital number, since it uses as much as digits as its factorization.

131444321221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

Adding to 131444321221 its reverse (122123444131), we get a palindrome (253567765352).

The spelling of 131444321221 in words is "one hundred thirty-one billion, four hundred forty-four million, three hundred twenty-one thousand, two hundred twenty-one".